/**
 * WS15: Registry fetcher — HTTP fetch + atomic cache write.
 *
 * Fetches the registry from the remote URL, validates it, and writes to
 * ~/.cave/agent/registry-cache.json atomically (write-then-rename).
 */
import { type Registry } from "./schema.js";
export type FetchChannel = "stable" | "beta";
export type FetchRegistryResult = {
    ok: true;
    registry: Registry;
    cached: boolean;
} | {
    ok: false;
    error: string;
};
/**
 * Fetch registry JSON from remote URL, validate, and atomically write to
 * cachePath. Returns the validated Registry on success.
 *
 * @param cachePath  Absolute path to write the cache file.
 * @param channel    "stable" (default) or "beta".
 * @param fetchImpl  Injectable fetch (defaults to globalThis.fetch / Node 18+).
 */
export declare function fetchAndCacheRegistry(cachePath: string, channel?: FetchChannel, fetchImpl?: typeof fetch): Promise<FetchRegistryResult>;
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